Budapest International Fair: László Bíró, journalist, introduces his invention, the ballpoint pen, developed with his brother Georg, a chemist. Biro then patented the invention in Paris in 1938. The patent, as well as the trademarked name, eventually entered the public domain. However, a ‘biro’ is still the colloquial name for a pen in Britain.
With the expiry of the French patents, László and his brother Georg moved to Argentina in 1943, and filed Argentinean patents.
László died in Buenos Aires in 1985. “Inventor’s Day” in Argentina is commemorated on September 29, his birthday.
– after Wikipedia